Got my Tata Indicom data (which is basically a Huawei E321) card to work my laptop running Ubuntu Edgy. It was fairly straightforward process, with ubuntu automatically doing most of the work. :)
1. After inserting the card, the modem got detected at /dev/ttyUSB0.
sudo wvdialconfand it setup the default configuration
3. The I edited the /etc/wvdial.conf file to setup the Phone number, Username and password.
Phone = #7774. Now run sudo wvdial R and that's it. After a series of debug messages, you should be connected to the internet.
Password = internet
Username = internet
Now I still need to figure how to get the signal strength of the network Iam in.